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### Course: Geometry (all content)>Unit 10

Lesson 6: Dilations

# Performing dilations

To dilate a point on a coordinate plane, you multiply its coordinates by a scale factor. The scale factor is a positive number that tells you how much to enlarge or shrink the point. If the scale factor is greater than 1, the point moves away from the origin. If the scale factor is less than 1, the point moves closer to the origin. Created by Sal Khan.

## Want to join the conversation?

• what would we do if the question doesn't have a point of dilation?
• Well, depends on what the question's asking for, but generally I'd say probably pick 0,0 or some other arbitrary point - 0,0 is easiest, and if it didn't give you the point of dilation it must not be important to the answer.
• Upvote please and comment if you want me to explain! Did you? Thanks
• I feel like these comments are made by bots because this site is only used by 4th or lower grade levels but so many people are typing like middle school?
• Where did you get 18 from?
• Sal multiplied the vertical distance between A and the point of dilation by 3 in order to obtain the y coordinate of A'
(1 vote)
• Has Sal ever gotten a question wrong?
• no he has never worked for a quest to help us out .
• I am having trouble as well and I have a test tomorrow.
• Do you know the equation for it though!
• How would I do this but with a fraction for the scale factor. Something like scale factor: 1/4